Downgrade, using memory card, choose on of them
- A37fEX_11_OTA_014_all_201610141638.zip,
OTA, copy to flash disk and run from recovery menu - A37fEX_11 jadul.zip
- A37fEX_11_A.07_160614 (RepairMyMobile.in).rar,
oppo a37f v16 suport root, flash it using flash tool - ROOT A37F OTA 161221.zip
Rooting tools - geteröppoa37f.rar
For unbrick a37f using qfill
After that you can root using kingroot